<!DOCTYPE html>
<html>
  <head>
    <meta charset="UTF-8">
    <title>Hello World!</title>
  </head>
  <style>
    body {
      margin: 40px;
      -webkit-app-region: drag;
    }
  </style>
  <body style="background-color: rgba(210,190,200,0.4); -webkit-user-select: none;">
    This window should be vibrant.
  </body>
  <script>
    window.addEventListener("resize", function(e){
      console.log(e.target.outerWidth)
    });
  </script>
</html>
